1750D

Overview

The Hammond Manufacturing 1750D is a single-channel audio output transformer designed for tube guitar amplifiers. It features a primary impedance of 2350 ohms and supports secondary impedances of 4, 8, and 16 ohms. The unit handles a power rating of 100W with a frequency range of 70 Hz to 15 kHz. It utilizes wire lead termination and is intended for chassis mounting in push-pull configurations.

Feature Summary

• Designed specifically for tube guitar amplifier output stages
• Supports multiple secondary impedance options for flexible speaker matching
• Engineered for high-power handling in push-pull applications

Applications

• Tube guitar amplifier output stages
• Push-pull amplifier circuits
• Audio signal transformation in vintage-style equipment

Procurement Notes

Verify the specific secondary impedance requirement (4, 8, or 16 ohms) against the target amplifier design before ordering. Confirm that the 2350-ohm primary impedance matches the vacuum tube plate-to-plate load requirements. Ensure the chassis mounting style and wire lead termination are compatible with the existing enclosure layout. Cross-reference the 100W power rating with the amplifier's maximum output capabilities to prevent mismatch issues.

Selection Notes

Select this component when a 2350-ohm primary impedance is required for tube-based guitar amplification systems. The multi-tap secondary winding allows adaptation to various speaker loads without changing the transformer. Consider the physical dimensions and weight constraints, as the unit weighs approximately 3 kg. This model is suitable for designs requiring robust power handling and wide frequency response within the specified audio band.

Part Context

The 1750D belongs to the Hammond 1750 series of tube application power transformers. This series includes variants like the 1750L and 1750F, which differ primarily in primary impedance and power ratings. The 1750D is distinct within the family due to its specific 2350-ohm primary specification and 100W capacity, catering to mid-to-high power guitar amp architectures.

Replacement Considerations

Direct substitutes within the same series include the 1750L and 1750F, though these have different primary impedances and power ratings. Verify compatibility carefully as the 1750L offers 60W with a 4200-ohm primary, and the 1750F provides 15W with a 6950-ohm primary. No other exact functional equivalents are documented in the provided data.